Threshold-based alerts
You can use the Threshold-based alerts to create impact alerting with a user-selectable distance threshold to avoid specific hazards. If 0 is entered in any of these fields, only direct intersections with hazards will generate an alert.
To create Threshold-based impact alerting
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In the Main ribbon, click Monitor/Alert.
The Monitor and Alert Settings window appears.
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Click Aircraft Options.
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In the Aircraft Options window, Route impact detection distance parameters may be set.